When can I plant Canna in Zone 2a

One of the best tools that we have as gardeners to help us figure out our gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for our area.

A common way of making a decision about when it's a good idea to plant canna is to consult the USDA zone info for Zone 2a.


Planting Calendar for Canna

Frost tolerance for canna: Not tolerant of frost.
When you should plant them: After the last frost when the weather gets warmer.

Since canna require warm weather it's necessary to wait until after the last frost has passed before you can plant them.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant canna
Possibly ok, but a risky time to plant canna
Probably not a good time to plant canna

The earliest that you can plant canna in Zone 2a is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant canna and expect a good harvest is probably August. If you wait any later than that and your canna may not have a chance to really do well. If you are starting your canna indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

The average date of last frost is May 15 in Zone 2a. We should expect an average low temperature of -50°F in the coldest months of winter.

Always keep in mind that our actual date of last frost is not always accurate because it is based on the USDA zone info for Zone 2a and it changes from year to year. Half of the time in Zone 2a we get surprised by a frost after May 15 so make sure that you are prepared to cover your canna if we have one of those late frosts.

USDA Zone Info for Zone 2a

Here is the info for USDA Zone 2a.

Average Date of Last Frost (spring)May 15
Average Date of First Frost (fall)August 15
Lowest Expected Low-50°F
Highest Expected Low-45°F

This means that on a really cold year, the coldest it will get is -50°F. On most years you should be prepared to experience lows near -45°F.

Plants to Grow in Zone 2a

You may be interested in our other planting guides for Zone 2a.